Pulverizer.



W. H. HESS.

PULVEEIZER.

APPLIOATION FILED APR. 30.1907.

Patented Jan. 19, 1909.

3 SHEETS-SHEET 1.

W. H. HESS.

PULVERIZER.

APPLIOATIOI I FILED APR.30.1907.

Patented Jan. 19, 1909.

3 SHEETS-SHEET 2.

W. HFHESS.

PULVERIZER.

APPLICATION FILED APR.30.1907.

910,196, Patented Jan.19,1909.

3 SHEETS-SHEET 3.

.zers, of which the WILLIAM H.

HESS, OF llEWEY, OKLAHOMA.

PULVERIZER:

Specification of Letters Patent.

Patented Jan. 19, 1909.

Application filed. April '30, 1807. 'jerial no. 871,069. f

To all whom u may concern:

Be it known that I, WILLIAM H. Hnss, citizen of the United States, residing at Dewey, Oklahoma, have invented certain new and useful Im rovements in Pulveri ollowing is a specification. This invention contemplates certain new and useful improvements in machines for pulverizing stone, slate and similar materlal, and relates more particularly to that type of pulverizing machine which operates upon the material in suspension.

The primary object of the invention is to provide a durable and efficient constructlon of machine of this character which is capable of producing within the" machine/ and without the necessity of outside screening,

ulverized stone of any desired degre 0f fineness and the invention consists of certain constructions and arrangements and.combi nations of the parts whichI shall hereinafter describe, tqgether with the advantages thereof, and then point out the novel features in the appended claims.

of the invention and the merits thereof an also to acquire a knowledge of the details of construction and the means for efiecting the result, reference is'to be had to the following description and accompanying drawings, in which:

Figure 1 .is a top plan view of a pulverizing machine embo ymg the principles of my invention, parts bein broken away to show the interior constructlon. Fig. 2 is a transverse sectional view of the machine on an enlarged scale. Fig. 3 is a detail perspective view of a portion of one of the heads of the cylinder, and several breaker plates in connection therewith; Fig. 4 is a detail plan view of one section of one of the screens.

Fig. 5 is a longitudinal sectional view throughthe pulverizer cage. Fig. 6 is a detail perspective view of one of the disks of sald cage. Fig. 7 is an end view of one of the sections of one screen.

Corresponding and like parts are referred to in the followin description and indicated in all'the views 0 the drawings by the same reference characters.

The main shaft 1 of myimproved pulverizing machine is shown in the resent instance as provided with a pul ey 2 over which the belt 3 extends, so .as to drive said shaft from an electric motor or any other suitable source of power. The shaft 1 is mounted to turn in bearings 4 of which in the present instance there are two at one side of the machine and oneat the other. The pulverizer'cage is mounted fast on shaft 1 and comprises a series of heads or disks 5 spaced from each other on the shaft and referably constructed in halves so as to acilitate their application to and removal from the shaft, said halves being clamped to the shaft by means of hub bosses 6 and lateral extensions 7 bolted together, as shown.

The several disks 5 are formed near their margins with preferably rectangular openings 8, the openings of the respective disks registring and receiving a series of breaker bars 9 that are preferably rectangular as shown, and that are backed by supporting or reinforcing bars 10, as best seen in Fig. 2. These bars are held in place preferably by means of countersunk set screws 11 and they are set far enough back from the margins of the disks 5 to leave suflicient metal beyond them so as to withstand the centrifugal strain of the rapidly rotating cage.

Within hollow bearings 12 the tubular lateral extensions 13 and 14 of heads 13' and 14 are journaled, the shaft 1 extending entirely through the said hollow extensions 13 and leaving a space around the shaft at one of the extensions, as best illustrated in Fig. 1, so as to provide an entrance opening for feeding the material into the machine. The said heads 13 and 14 are formed near their margins 'with a circumferentially extending series'of oblique slots or grooves 15,

and the breaker plates 16 are held at their ends in said grooves and extend. from one head to the other, said plates being spaced from each other as shown, and beingmanifestly held at angles to the radius of the heads, as best seen in Fig. 2. Beyond the series of breaker plates 16,the said heads are formed with annular recesses 17 in which the sections 18 of the cylindrical screen are fitted. Each of these sections 18 is provided with outstanding flanges 19 on all sides and the several sections are secured together by bolts extending through the abutting side fianges, as best seen in Fig. 2 of the drawings. The several sections 18 are each formed with a series of obliquely extending slots 20.

A secondary [or supplemental screen 21, preferably of wire mes of the requisite degree of fineness, incloses the pr mary screen which is composed of thesectlons 18, said screen 21 being secured to the main or primary screen in any desired manner so as to turn therewith. A casin 22 incloses the screens so as to prevent the dust from ing and to serve as a means for directing the pulverulent material to the discharge mouth or chute 24, and the casing is provided at its top asshown, with an air inlet 23.

A gear wheel 25 is secured to the extension lat of the head 14 and said gear wheel meshes with a relatively small pinion 26 on the same shaft with a gear wheel 27. The gear wheel 27 meshes with a inion 28 on a countorshaft 29. A pulley 30 1s fast on the shaft 22) and a belt 31 operatively connects said pulley 30 with a sm'aller pulley 32 on the main driving shaft 1., Thus it wlll be seen that, through the instrumentality of the gearing just described, the cylinder which is composed of the series of breaker plates, the screens, and the heads carrying said screens is driven from the main shaft 1 of the pulverizer cage.

From the foregoing description in connection with the accompany ng drawings, it will be seen that I have provided a pulverizing machine in which the screens revolve, as well as the pulverizer cage. Machinesthat are built with stationary screens manifestly do not have suflicient screening surface for the finer grades of grinding, because the screenswhen stationary cannot keep up with the capacity of the mill and consequently the screens must be made of coarse mesh and the fi er grades of pulverulent materials obtaine by screening operations outside of the: pulverizing machine. Machines with stationaryscreens are also objectionable in that-"the stationary screens cause wear of the. hammer and also m ch unnecessary consumption of power. It is also I to be observed that the breaker plates are placed at such an angle that the material will be carried up andl dumped on to of the breaker bars and not before it reac es the top. The material may be kept in the mill until the desired fineness is obtained, as the material is returned to the breaker bars when it will not pass the fine or secondary screen, or when it will not even pass the cast sectional screen. In the practical operation, the pulverizing cage is run at a very high speed and the cylinder with its breaker plates and screens at a slower speed. As the plates take, up the material, they carry it up until the slope" is such that the material falls on to the pulverizing cage below. These plates, it will be seen, serve a plurality of'functions, to wit: The material in a more or less shattered condition is thus J thrown against them, whereupon additional breaking takes place, and the said plates serve to protect the screens from the impact of the flying material, as well as serving as revolving carriers to carry the material and drop it upon the rapidly rotating pulverizer cage. The space between the revolving hannners or cage and the breaker plates is of considerableadvantage as it permits of the impingement of material against material, causing it to be ground against itself.

In this machine there are, as above described, two revolving screens, one of which ,may be termed the main or primary, and the other the secondary screen. The primary screen next to the series of breaker plates is preferably made in'cast sections and it is noted that it serves, together with the breaker plates, to protect the secondary or outside screen which may be of an desired fineness or mesh, according to the egree to which it is desired the material shall be ground. When the material reaches this degree of fineness it will ass out of the mill, but all of the tailings W11 be returned to be further acted upon by the pulverizer cage. The sectional main screen is so constructed that by removal of one screen section, two breaker plates may be removed, allowing entrance into the interior of the mill for purposes of repair or the like.

Referring particularly to my struction of pulverized cage, 1t is obvious that it will require less power to drive it than for the hinge hammer type of revolving cages, and that it will make less air current and hence less dust. By providing backin s 10 forthe hammer bars 9, the latter can 0 worn nearly out'before renewal is necessary. Furthermore, it is obvious that the said hammer bars may be renewed at sli ht expense and without the necessity of oing away with the entire cage or with any portion novel coni thereof except the bar which 'is to be replaced.

The disks 5 serve as fly wheels to always maintain the cage in balance, which is an ilmportant feature of a fast revolving cylin- Havin thus described the invention, what is claime as new is:

' 1. In a pulverizing machine, the combination of a rapidly rotatin pulverizer cage formed with a peripheral row of breaker bars, means for rotatln the pulverizer cage, a slowly rotating cylinder inc'losing the pulverizer cage, means for rotating the cylinder a primary screen applied to the periphery of the cylinder, a secondary screen also applied to the periphery of the cylinder and mclosing the primary screen, the said secondary screen being spaced from the primary screen in the cylinder and dropping it upon the exterior of the pulverizer cage so that it is broken by i pact with the rapidly rotating breaker bars until it is sufiieiently fine to pass through the two screens.

2. In a pulverizing machine, the combination of a shaft, a pulverizing cage mounted on the shaft, hollow bearings surrounding the shaft, a cylinder journaled upon the hollow bearings and inclosing the pulverizer cage, means for rotating the cylinder, and means carried by the'eylinder tor cooperating with the pulverizer cage to break up the material therein.

3. In a pulverizing machine, the combination of a shaft, a pulverizer cage mounted upon the shaft, means for rotating the shaft, hollow bearings surrounding the shaft, a cylinder j oui-naled in the hollow bearings and inelosing the pulverizer cage, means for transmitting motion from the shaft to the cylinder, a screen carried by the cylinder, and means carried by the cylinder for shielding the screen from the impact of material discharged b the pulverizer cage.

4. In'a puiirerizmg machine, the combination of a shaft, a pulverizer cage mounted upon the shaft, means for rotating the shaft, hollow bearings surrounding the shaft, a cylinder journaled upon the hollow bearings and inclosing the pulverizer cage, a primary screen carried by the cylinder, a secondary screen also carried by the cylinder and inclosing the primary screen, breaker plates carricd by the cylinder for dropping the material within the cylinder upon the pulver-. izer cage and cooperating with the primary screen to protect the secondary screen, andmeans for transmitting motion from the shaft to the cylinder.

In testimony whereof I afiix my signature in presence of two witnesses. WILLIAM H. HESS. [a s.]

Witnesses:

ADRIAN DE YONG, Jr., ,4). H. SPAYDS. 

